net: sched: move rtm_tca_policy declaration to include file

stable inclusion
from stable-v5.10.184
commit 54acac57fe39458fdf2b9e9347aa93f84dd9e5ec
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8IRR2

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=54acac57fe39458fdf2b9e9347aa93f84dd9e5ec



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[ Upstream commit 886bc7d6 ]

rtm_tca_policy is used from net/sched/sch_api.c and net/sched/cls_api.c,
thus should be declared in an include file.

This fixes the following sparse warning:
net/sched/sch_api.c:1434:25: warning: symbol 'rtm_tca_policy' was not declared. Should it be static?

Fixes: e331473f ("net/sched: cls_api: add missing validation of netlink attributes")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>
(cherry picked from commit d67bfec5)